Btrfs: fix cache_block_group error handling

cache block group had a few bugs in the error handling code,
this makes sure paths get properly released and the correct return value
goes out.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c0bb6b9ac4c6b7af43430927826e670ef5cdcd11..1c10ffc837c863825624e11ec6d9ec9791b6c700 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -66,7 +66,7 @@ static int cache_block_group(struct btrfs_root *root,
                             struct btrfs_block_group_cache *block_group)
 {
        struct btrfs_path *path;
-       int ret;
+       int ret = 0;
        struct btrfs_key key;
        struct extent_buffer *leaf;
        struct extent_io_tree *free_space_cache;
@@ -102,10 +102,10 @@ static int cache_block_group(struct btrfs_root *root,
        btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
        ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
        if (ret < 0)
-               return ret;
+               goto err;
        ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
        if (ret < 0)
-               return ret;
+               goto err;
        if (ret == 0) {
                leaf = path->nodes[0];
                btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
@@ -161,9 +161,10 @@ next:
                                 last + hole_size - 1, GFP_NOFS);
        }
        block_group->cached = 1;
+       ret = 0;
 err:
        btrfs_free_path(path);
-       return 0;
+       return ret;
 }
 
 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct